LMT MRP-L MLOK | 13.25 Upper Receiver

The LMT MRP-L MLOK 13.25 Upper Receiver is designed for AR-15 platform rifles chambered in calibers such as 5.56×45 NATO and .300 Blackout when paired with a compatible LMT barrel assembly. Built around LMT’s Monolithic Rail Platform (MRP™), the receiver and handguard are machined from a single piece of aerospace-grade aluminum, providing a rigid and unified structure for mounting optics and accessories. The proprietary quick-change barrel system uses two locking bolts, allowing barrel installation or removal with a standard T-30 Torx tool.

This upper features M-LOK® attachment points along the handguard, offering flexible accessory mounting across multiple positions. Designed for use with rifle-length barrel configurations ranging from approximately 14.5 to 20 inches, it also includes multiple QD sling swivel attachment points for added versatility. The upper receiver is sold without a barrel, allowing users to configure their setup based on caliber and intended use.

Specifications

• Platform: MRP-L (Light)
• Caliber Compatibility: 5.56×45 NATO, .300 Blackout, 6.8, 6 ARC(with compatible barrel)
• Construction: Monolithic aerospace-grade aluminum receiver and handguard
• Barrel System: Proprietary LMT quick-change barrel system (barrel not included)
• Handguard Length: 13.25 inches
• Mounting Interface: M-LOK® attachment system
• Sling Mounts: 4 QD sling swivel attachment points
• Tool Requirement: T-30 Torx wrench for barrel installation
• Barrel Compatibility: LMT monolithic barrel assemblies only
• Recommended Barrel Lengths: Approx. 14.5" to 20"